Dr. Carlos H. Zem, MD
- Medicare services, 2024
- 1,772
- Medicare patients, 2024
- 276
- Part D claims, 2024
- 2,921
- MIPS score, 2024
- 75
- Hospital affiliations
- 2
- Practice address
- 1123 N Main Ave, San Antonio, TX 78212
- Practice phone
- Call (210) 614-1231
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Renal Associates, P.A.
San Antonio, Texas
Find Dr. Zem's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Carlos H. Zem is a nephrologist in San Antonio, Texas
Dr. Zem practices at Renal Associates, P.A. in San Antonio, Texas.
Dr. Zem's NPI, 1437237914, was assigned on November 1, 2006. Dr. Zem graduated from Universidad Autonoma de Guadalajara in 2002. Dr. Zem holds Texas license N2350.
- NPI
- 1437237914NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6305948498
- NPI enumeration date
- November 1, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (210) 614-1231
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Carlos H. Zem practices at Renal Associates, P.A. in San Antonio, Texas
Dr. Zem's primary practice is Renal Associates, P.A., at 1123 N Main Ave, San Antonio, TX 78212 in Bexar County. The practice phone is (210) 614-1231.
- Renal Associates, P.A.1123 N Main Ave, San Antonio, TX 78212 · Bexar CountyPhone(210) 614-1231
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Carlos H. Zem is affiliated with 8 sites of care and 1 medical group
Dr. Zem's primary practice is Renal Associates, P.A. in San Antonio, Texas. Dr. Zem is also affiliated with Methodist Hospital. The medical group on file is Renal Associates. Dmand AI also links Dr. Zem to 1 more hospital, 4 dialysis centers and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Carlos H. Zem's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zem practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Renal Associates, P.A. | Available with a free account |
| +7 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Carlos H. Zem is one of 1,045 nephrologists in Texas
Nephrology is Dr. Zem's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Zem is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Zem's licenses on file in 2 states: Texas and California.
Specialties and state licenses
- Nephrology, TexasPrimary
- California license
Clinical focus
Dmand AI lists acute kidney failure, chronic kidney disease, fluid and electrolyte imbalances and hypercalcemia among the conditions Dr. Zem treats.
Nephrologists near Dr. Zem
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Carlos H. Zem billed Medicare for 1,772 services in 2024
CMS data shows 1,772 Medicare services from Dr. Zem across 14 procedure codes in 2024, for 276 Medicare patients. Medicare paid $166,031 for them.
Dr. Zem's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,4692024: 1,15721%
- Tests and treatments
- 2023: 6422024: 41835%
- Other services
- 2023: 02024: 197
- Lab and pathology
- 2023: 202024: 0100%
Where Dr. Zem's Medicare services took place, 2024
- In an office1,25371%
- In a facility51929%
Dr. Zem compared with the Texas median for nephrologists, 2024
- Dr. Zem
- Texas median
- Medicare services
- 1,772vs 1,04869% above
- Medicare patients
- 276vs 277Close to median
- Part D claims
- 2,633vs 7583.5 times
Medians across 1,017 nephrologists in Texas with Dmand AI profiles that report each measure.
Dr. Zem's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zem and other nephrologists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Carlos H. Zem treated 276 Medicare patients in 2024, average age 72
CMS counts 276 Medicare patients who saw Dr. Zem in 2024. The largest group is 75 to 84, with 94 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 30% are also on Medicaid. Their average risk score is 4.65, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Zem's median patient age at 68, with 47% women.
Dr. Zem's Medicare patients by age, 2024
Dr. Zem's Medicare patients by sex, 2024
- Women12846%
- Men14854%
Chronic conditions among Dr. Zem's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes71%
- Ischemic heart disease55%
- Heart failure47%
- Arthritis37%
- Atrial fibrillation32%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zem's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women47%
- Men52%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Carlos H. Zem wrote 2,921 Medicare Part D claims in 2024
In 2024, Dr. Zem wrote 2,921 Medicare Part D claims for 361 patients. 77% of them were for generic drugs. CMS names the drug for 2,633 of them, across 51 drugs with 11 or more claims each, at $961,103 in total drug cost. In 2023, CMS named 2,243 claims across 46 drugs.
Dr. Zem's Part D claims by kind of drug, 2024
- Generic2,239 claims77%
- Brand-name and other682 claims23%
Dr. Zem's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Zem's Part D claims, 2024
- Opioids1%36 of 2,921 claims
- Antibiotics4%107 of 2,921 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,2432024: 2,63317%
Drugs named by CMS: 51 in 2024, 46 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Carlos H. Zem scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Zem for performance year 2024, reported as part of a group. Dr. Zem accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Zem as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- MIPS final score, 2024
- 75 of 100
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Carlos H. Zem received $2,740 in industry payments from 2016 to 2025
CMS Open Payments shows 98 general payments to Dr. Zem from 29 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Fresenius USA Marketing, Inc. paid the most, $442.
General payments to Dr. Zem by program year, 2016 to 2025
General payments to Dr. Zem by kind, 2016 to 2025
- Food and beverage$2,70199%
- Education$391%
Companies that paid Dr. Zem the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Carlos H. Zem has 1 award and honors on record
Dmand AI lists 1 award for Dr. Zem, most recently CMS Stage 1 EHR in 2012.
Awards and honors for Dr. Zem
- 2012
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Carlos H. Zem graduated from Universidad Autonoma de Guadalajara
Dr. Zem graduated from Universidad Autonoma de Guadalajara in 2002.
- Medical school
- Board certified in internal medicine
- Board certified in nephrology
- Board certified in internal medicine
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Carlos H. Zem accepts plans from 22 insurance carriers
Dr. Zem is in network with 22 carriers, including Elevance, United Healthcare and Blue Cross Blue Shield of Michigan. HMO plans come from the most carriers, 13. Check the plan with the practice before a visit.
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Aetna
- Cigna
- HCSC
- Humana
- Alliant Health Plans
- +14 more carriersWith a free account
Plan types Dr. Zem accepts, by number of carriers
- HMO13
- PPO13
- Medicare10
- POS5
- EPO4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Carlos H. Zem's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Carlos H. Zem
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Carlos H. Zem's NPI number?
Dr. Carlos H. Zem's NPI number is 1437237914. It was assigned on November 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Carlos H. Zem?
Dr. Carlos H. Zem is a nephrologist in San Antonio, Texas. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Carlos H. Zem practice?
Dr. Zem practices at 1123 N Main Ave, San Antonio, TX 78212. Dr. Zem's primary practice is Renal Associates, P.A. in San Antonio, Texas. Dmand AI also links Dr. Zem to 1 hospital, 4 dialysis centers and 1 group practice or clinic.
What is Dr. Carlos H. Zem's office phone number?
The practice phone on file for Dr. Zem is (210) 614-1231.
What is Dr. Carlos H. Zem's medical license number?
Dr. Zem holds Texas license N2350, one of the licenses on file in 2 states.
Which states has Dr. Carlos H. Zem been licensed in?
Dmand AI has state licenses on file for Dr. Zem in Texas (2009 to 2026) and California (since 2004).
Which hospitals is Dr. Carlos H. Zem affiliated with?
Dr. Zem is affiliated with Methodist Hospital. Dmand AI links Dr. Zem to 1 more hospital.
What medical group is Dr. Carlos H. Zem part of?
Dr. Zem is linked to Renal Associates.
Does Dr. Carlos H. Zem accept Medicare?
Yes. CMS data shows Dr. Zem billed Medicare for 1,772 services in 2024, and Dr. Zem accepts Medicare assignment.
Does Dr. Carlos H. Zem offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Zem as offering telehealth services.
Show 9 more questionsShow fewer questions
What is Dr. Carlos H. Zem's MIPS score?
Dr. Zem's MIPS final score for performance year 2024 is 75 out of 100, reported as part of a group.
How many Medicare patients does Dr. Carlos H. Zem see?
CMS counts 276 Medicare patients who saw Dr. Zem in 2024, with an average age of 72.
Is Dr. Carlos H. Zem board certified?
Yes. Dr. Zem is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Carlos H. Zem bill to Medicare?
In 2024, Dr. Zem's most billed Medicare services were dialysis (90960), care management and other visits (99490) and hospital inpatient care (99233).
Where did Dr. Carlos H. Zem go to medical school?
Dr. Zem graduated from Universidad Autonoma de Guadalajara in 2002.
What drugs does Dr. Carlos H. Zem prescribe most?
In 2024 Medicare Part D data, Dr. Zem's most prescribed drugs by claims were Carvedilol, Losartan Potassium and Jardiance.
Has Dr. Carlos H. Zem received payments from drug or device companies?
CMS Open Payments shows $2,740 in general payments to Dr. Zem from 29 companies from 2016 to 2025. The largest total came from Fresenius USA Marketing, Inc.
How long has Dr. Carlos H. Zem been practicing?
Dr. Zem graduated from medical school in 2002, 24 years ago.
What insurance does Dr. Carlos H. Zem accept?
Dr. Zem is in network with 22 carriers, including Elevance, United Healthcare and Blue Cross Blue Shield of Michigan. HMO plans come from the most carriers, 13. Check the plan with the practice before a visit.
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